Question

An alligator population in a nature preserve in the everglades decreases by 60 alligators over 5 years what is the mean yearly change in the alligator population

Answer 1

An alligator population decreases by 60 alligators over 5 years.
60 : 5 = 12
The mean yearly change of population:
it decreases by 12 alligators over year.